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I would want to know in which package the symbol \hbar is defined. In fact I ask this because I need to create a letter like \hbar but with 'k' instead of 'h'.

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\hbar is defined in the LaTeX kernel:

\newcommand{\hbar}{\mathchar'26\mkern-9mu h}


\newcommand{\kbar}{\mathchar'26\mkern-9mu k}

should do what you want (although it might need some customization if other fonts are used).

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Thank you ! I tried something like that but I made some mistakes. Where can I find the LaTex kernel under fedora ? – PanAkry Mar 3 '12 at 13:56
If you have a fairly recent TeX Live distribution, then the shell command texdef -t latex hbar will reveal the definition. You can then look for the "official" one in latex.ltx: less $(kpsewhich latex.ltx) – egreg Mar 3 '12 at 14:05

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